Briquettes for mineral fibre production and their use

Details Briquettes for mineral fibre production and their use Briquettes for mineral fibre production and their use

C - Chemistry, Metallurgy

03

C

261/20, 49/9

C03C 1/00 (2006.01) C03C 13/00 (2006.01) C03C 13/06 (2006.01)

Patent

CA 2312838

A process is provided for the production of man-made vitreous fibres having a composition which contains at least 14 % aluminium measured as weight Al2O3 based on oxides, comprising providing in a shaft furnace a self-supporting stack of a mineral charge which includes briquettes, melting the charge to provide a melt at the base of the furnace having the composition of the fibres, removing melt from the base of the furnace and fiberising the melt, and at least one quarter of the aluminium in the charge is introduced as particulate alumina-containing mineral in briquettes and the particulate alumina- containing mineral contains from 0.5 to 10 wt.% metallic aluminium, 50 to 90 wt.% alumina Al2O3 and 0 to 49.5 wt.% other materials.

La présente invention concerne un procédé de production de fibres vitreuses dont la composition massique comporte, rapporté aux oxydes, au moins 14 % d'aluminium sous forme de Al2O3. Ce procédé consiste à placer dans un four à cuve de cuisson une cheminée autostable de charge minérale comprenant des briquettes, à faire fondre la charge pour obtenir au cul du four un bain de fusion, à évacuer par le cul du four le bain de fusion, puis à fibériser le bain. En l'occurrence, un quart au moins de l'aluminium de la charge est introduit sous forme de briquettes de matière minérale particulaire renfermant de l'alumine. De fait, cette matière minérale particulaire renfermant de l'alumine est constituée d'aluminium métal pour 0,5% à 10% de la masse, d'alumine (Al2O3) pour 50% à 90% de la masse, et d'autres matériaux pour 0% à 49,5% de la masse.

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